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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I met exactly same issue as cazyw, then I figured out this was because I changed strarr using shift method, then I updated my solution without changing it all test passed, although this should be test case issue.